Thermoplastic polyesters

Abstract

High impact and solvent resistant composition comprising (A) about 25 to 95 percent by weight of an aromatic polyester, (B) about 1 to 8 percent by weight of an aromatic polycarbonate, and (C) and balance to make 100% of a coreshell polymer having a butadiene-based core. Preferably the composition also includes about 1 to 150 parts by weight of glass fiber reinforcement per 100 parts of (A), (B), and (C).

We claim: 
     
       1. A composition having high impact and solvent resistance comprising A. about 25 to 95 percent by weight of an aromatic polyester;   B. about 1 to 8 percent by weight of an aromatic polycarbonate;   C. the balance to make 100% of a core-shell polymer polymerized from monomers comprising butadiene.   
     
     
       2. The composition of claim 1 wherein the aromatic polyester is polyethylene terephthalate. 
     
     
       3. The composition of claim 2 wherein the polyethylene terephthalate has an estimated intrinsic viscosity range of about 0.3 to 2.5. 
     
     
       4. The composition of claim 1 wherein the core-shell polymer has a core polymerized from over 50 percent butadiene. 
     
     
       5. The composition of claim 1 further including filler comprising particulate filler, fibrous reinforcement, or combinations thereof. 
     
     
       6. The composition of claim 1 further including about 1 to 150 parts by weight glass fiber reinforcement, based on 100 parts by weight of (A), (B), and (C). 
     
     
       7. The composition of claim 1 wherein the aromatic polyester (A) is polyethylene terephthalate, having an intrinsic viscosity of about 0.5 to 1.2 and the aromatic polycarbonate (B) is the reaction product of phosgene and bisphenol A. 
     
     
       8. The composition of claim 7 wherein the core-shell polymer (C) has a core polymerized from a monomer system comprising butadiene, styrene, methyl methacrylate, and divinyl benzene, a second stage polymerized from styrene, and a final stage polymerized from methyl methacrylate and 1,3-butylene glycol dimethacrylate. 
     
     
       9. The composition of claim 8 further including about 20 to 100 parts of glass fiber reinforcement. 
     
     
       10. An injection molded article molded from the composition of claim 1.